Kufr, The pejorative term alludes to a person who rejects or disbelieves in God, as defined by Muslims. denies, refuses to accept the dominion and authority of God; or otherwise does not heed the beliefs and prescriptions held by the religion of Islam. Unbelief is called kufr. The term is often used by Salafi Muslims in reference to Cultural Muslims and those who do not actively practise their faith.